The recent cluster of illnesses linked to the expedition ship MV Hondius has drawn attention to how rare but serious infections can affect travelers. Public health authorities, including WHO, ECDC, and the CDC, have investigated the situation; WHO was notified on 2 May 2026 and reported a multi-country cluster, and by 13 May 2026 official counts included 11 cases with 3 deaths. Experts emphasize that the wider public risk remains very low to extremely low, while underscoring that exposed passengers, crew, and close contacts should be monitored. The responsible pathogen has been identified as Andes virus, a type of hantavirus associated with severe respiratory illness in some patients.
Cruises remain a popular way to see multiple ports, but the confined setting can amplify common illnesses. This article explains what is known about the MV Hondius cluster, the nature of Andes virus infection, and practical precautions to reduce risk from both this and more typical onboard hazards. Read this as a concise health checklist rather than a reason to cancel travel: the guidance combines outbreak details with routine travel-health steps such as vaccination, hygiene, and preparing a travel health kit.
What happened and how officials assess risk
Investigations indicate that the event linked to the MV Hondius involved passengers who developed severe respiratory disease consistent with hantavirus pulmonary syndrome. While Andes virus is unique among hantaviruses for rare documented person-to-person transmission, such spread typically requires close or prolonged contact. Public-health agencies concluded the incident is serious for those exposed but not likely to cause widespread community transmission. Official assessments from WHO, ECDC, and CDC describe the broader public threat as low, and response actions have focused on contact tracing, testing, medical follow-up, and coordinated repatriation of affected travelers.
Common health threats on cruises and how to reduce them
Respiratory viruses
Respiratory infections such as COVID-19, seasonal influenza, RSV, and the rare but concerning Andes virus can cause cough, fever, fatigue, and in some cases breathing difficulty. Symptoms from Andes virus may appear between 4 and 42 days after exposure and can start with fever, muscle aches, headache, nausea or diarrhea before respiratory signs emerge. Preventive steps include staying current with routine vaccines (for example, annual influenza shots and any eligible COVID-19 or RSV vaccines), frequent hand hygiene, avoiding travel while ill, and wearing a mask in crowded or poorly ventilated indoor areas when risk is elevated. If you develop fever followed by shortness of breath, seek urgent care and inform clinicians about recent cruise travel and possible exposure.
Gastrointestinal and other hazards
Outbreaks of norovirus cause vomiting and diarrhea aboard ships more commonly than exotic infections. To reduce gastrointestinal risk, wash hands with soap and water before meals and after restroom use, avoid touching your face, and use hand sanitizer when soap is unavailable. Other cruise hazards include seasickness (ask your clinician about safe medications and note that some drugs can worsen motion sickness), sunburn (use sunscreen SPF 15 or higher and protective clothing), and insect-borne illnesses at certain ports (use insect repellent and know which vectors—such as mosquitoes or ticks—are a concern at your destinations).
Before, during and after your trip: practical steps
Before you go
Plan ahead by checking destination-specific health notices and confirming required or recommended vaccines on official travel pages. Make an appointment with a healthcare provider or travel clinic at least 4 to 6 weeks before departure to discuss necessary immunizations, malaria or other prophylaxis where relevant, and any personal health concerns. Bring a copy of your official immunization records and a list of prescriptions. For people with weakened immune systems, review risks and mitigation strategies with a clinician; they may advise extra precautions when traveling.
Pack, insurance and what to do if symptoms appear
Create a travel health kit that contains your regular prescriptions plus enough supply for the trip and extra for delays, over-the-counter remedies for common symptoms, hand sanitizer, insect repellent, sunscreen, and basic wound care. Confirm whether your health insurance covers care abroad and consider buying supplemental travel or medical evacuation insurance if you will be in remote areas. If you become unwell during travel, report symptoms to the ship’s medical center and follow their advice. After travel, if you develop fever or respiratory symptoms, contact a healthcare provider and mention recent cruise travel or exposure to someone with confirmed Andes virus or other serious infections. While sick, avoid contact with others to limit spread.